Author Page
dczip
This is a free program that the author describes as a clone of WinZip. It is written entirely in Java and supports a nice variety of archive formats, including zip, jar, gzip, and bzip2 Requires Java 1.3, 1.4 is recommended. The 1.0 release shipped in May of 2002.
ALZip
Another archiver, this one supports ZIP, ACE, RAR, TAR, and ZOO formats. This appears to be a Korean product - the web page is bilingual.
Almacom JPEG-2000 library
The page says:
The Almacom JPEG-2000 library was written in an effort to produce the cleanest and simplest implementation possible of the JPEG-2000 standard. We have put a particular emphasis on good architecture design and code simplicity, while at the same time providing an implementation as complete and efficient as possible.
DataCompression.info user Luca M. said […]
Compression and Coding Algorithms
by Alistair Moffat and Andrew Turpin. This book is scheduled for publication in 2002 by Kluwer Academic Publishers. This site has a table of contents and some sample pages to peruse while you wait for it to be printed.
This book now shows up as available on Amazon.com. Please use this
link
to purchase the book through Amazon.com. […]
On2 uses new video compression on film
CNet reports that On2 Technologies is using a feature film to demo their new compression technology. You can see “To Kill a Lawyer” over the Internet at several speeds ranging from 400 KBps up to 1MBps. The proprietary algorithm is called VP5.
ZipCentral
ZipCentral is a free and easy to use zip file manager with all the utilities you need to manage your zip files. The goal of ZipCentral is to be the most robust freeware zip-package you can find today. It is a great tool for the beginner as well as the expert. Working with zip files […]
Japanese Lossless Video Codec
I’ll have to take the word of the submitter on this site - it is entirely written in Japanese. Any DataCompression.info user who is fluent in the language is invited to provide a more detailed description. There are a couple of zip files on the site that perhaps contain demo programs?
GEMAC
This company sells an IP core that performs lossless data compression. Not sure what algorithm they are using, it is described as “GEMAC’s data compression algorithm.” This algorithm was first published at DCC ‘95, and is described as a hybrid of ZL1 and ZL2, created with the goal of maximizing compression rate.
IEEE Standard 1180-1990 accuracy test for IDCTs
From the archive: This archive contains a quick & dirty implementation of the IEEE Standard 1180-1990 accuracy test for inverse DCT. It is not guaranteed to be correct … but if you find any bugs, please let me know (by email totgl@cs.cmu.edu). Since the archive was created in 1993 I don’t know if you’ll […]
http://bmrc.berkeley.edu/ftp/pub/multimedia/mpeg/mpeg2/software/ieee1180.tar.gz
Florida Compression Scheme Nets Millions
This isn’t a new story, but the Florida Times-Union of Jacksonville gives a lot of detail in this treatment. A fellow named Madison Priest seems to have pulled in millions with his promises of hardware that can push high quality movies over conventional phone lines. Lots of interesting details, including the famous coax line hidden […]
http://www.jacksonville.com/tu-online/stories/050502/met_9322821.html
Elecard
This company has a roster of compression products, including an MPEG-2 Player, an MPEG-2 DirectShow Filter, and a Wavelet Image Compressor.
DataCompression.info user Kuka had this to say: Excellent mpeg player, and a lot of very useful mpeg tools.
Zipios++
A C++ open source library for accessing zip files. This is a work in development, which as of the current beta now has support for reading and writing Zip files. Distributed under the LGPL.
Image Compression - from DCT to Wavelets : A Review
by Subhasis Saha. A typical overview article, devoted to image compression, concentrates on JPEG and Wavelet-based methods. I don’t know where this article appeared, but it looks to be peer-reviewed quality.
Image Compression with Vector Quantization
This is billed as an introductory article with illustrations. I haven’t seen it - it requires free registration with this game development site. If you’re interested, please check it out and send me your thoughts.
Léon Bottou’s Publications
Léon has a very nice set of publications online here, generally in both DjVu and PS format. A total of 45 papers with titles such as “Managing drift in DCT-based scalable video coding” and “DjVu : Analyzing and Compressing Scanned Documents for Internet Distribution.”. Bless those who make their work available to the world on […]
Stack-run Image Coding
First sentence of the abstract says it all: We describe a new image coding approach in which a 4-ary arithmetic coder is used to represent significant coefficient values and the lengths of zero runs between coefficients
http://www.icsl.ucla.edu/~ipl/Publications/Journal/stack-run_image_coding.pdf
Wavelets and Subband Coding
by Martin Vetterli and Jelena Kovacevic. This book is a hefty academic tome, described on this web page as: a comprehensive and unified presentation of discrete and continuous wavelets, filter banks and subband coding, as well as multiresolution signal processing, is given. It is intended for practitioners and researchers in the fields of signal […]
Lossless Image Coding Using Minimum-Rate Predictors
This page presents the source code from the paper of the given name. The software at this time only supports eight-bit grayscale, but is free for research purposes.
More PKWare DCL Decompression Code
C++ code posted to comp.compression that describes extraction from PKWare’s Data Compression Library.
Update: The author posted this correction to comp.compression:
There’s a bug in the code posted 2001-10-07 19:36:38 PST. To fix:
In the
void tcDecoder::Decode(char *apBuffer, unsigned int *apSize, unsigned int anBufferSize)
function after both
if (lnIndex == mnCurrentPos) lnIndex = lnStartIndex;
add
if (lnIndex == mnDictionarySize) lnIndex = 0;
Aurora Borealis - a new way of compression
This document describes the Aurora Borealis algorithm, which combines statistical analysis with a back end using an unknown type of coding. Author Michael Asse seems to have high hopes for this technique.
DataCompression.info reader Viktor F. had this to say: This compression method is inefficient. LZW can beat this easily. The author should read some books […]
FreeImage
The Free, Quality Image library for Windows. This library decodes quite a number of image formats, but don’t expect to see GIF in there anytime soon. Perhaps after the patent expires…
Doom9’s MPEG Forum
This site is mostly oriented towards capturing and storing DVD - good advice on how to use various tools, codecs, hardware, etc. Very active site.
Real-Time Imaging
An academic journal focusing on imaging and compression. It appears that all the papers published in this journal are available on line in PDF format!
Web Graphics
A tutorial page discussing the various image formats currently in use on the web. Nice comparisons and a good set of links.
http://www.psychology.nottingham.ac.uk/staff/cr1/graphics.html
HP Labs LOCO-I/JPEG-LS Home Page
JPEG-LS is the new lossless/near-lossless compression standard for continuous-tone images developed by ISO/IEC JTC1/SC29/WG1 (final draft international standard FDIS14495-1 as of Novembr 1998). The standard is based on the LOCO-I algorithm (LOw COmplexity LOssless COmpression for Images) developed at Hewlett-Packard Laboratories
Update: The HP site has just added a JPEG-LS plugin for Photoshop, in addition to […]
Proseminar Datenkompression - Arithmetische Kodierung
This page gives an introduction to Arithmetic Coding and shows how to implement it using floats or integers. There is also a proof of the efficiency of the algorithms, along with visualization and Win32 binaries. This page is in English and includes links to material in both German and English.
DataCompression.info user Juergen Abel found the […]
Markov Predictive Coders : PPMZ
This directory contains source and executable for Charles Bloom’s PPMZ encoder, as well as a paper on PPMZ and some benchmark results. There are also links to a few other pages containing PPM information.
News: Charles Bloom has now released the source code to PPMZ2. He says it is both cleaner and faster than the […]
Huffman Coding with Priority Queues
This article is really about using the priority queue containers that are part of the standard C++ library. The example program implements a Huffman Encoder using the queues, showing how they can do a fairly complex piece of work without too much coding on your part.
3DCompression.com
A directory of links and resources on compressing the 3D models used for computer graphics and other large geometric datasets. This is a replacement for the site at http://www.cc.gatech.edu/~kingd/3Dcompression.html.
Digging Deep Into Compression
An article in Wired that talks about the use of compression for patten recognition. Tools as simple as Zip are able to accurately determine the language of a given text. More complex algorithms are being used to determine matches of DNA sequences.
